Can't get my NHC media to work.

I have one of the houses provided to premium members. I use it as a sort of mini theater (or want to anyway). I got a nice NHC media player to do this.

I have followed the set up instructions thoroughly. Quicktime is installed, right from their link in the instruction, the plug in for the flash player is there, the channel from the box is set on the TV..............I did everything.

I can use the radio options fine. The music plays. But, when I try to use any other option, it doesn't work. I want to watch the DVD movies, and I get sound, but no video.